Mountain Ash, also known as Eucalyptus regnans, is a tall tree native to southeastern Australia. It is one of the tallest tree species in the world, often reaching heights of over 300 feet. The tree features smooth, pale bark that sheds in strips and has narrow, lance-shaped leaves that are rich in oil. Mountain Ash thrives in cool, moist climates and is commonly found in mountainous regions. It plays a vital role in its ecosystem, providing habitat for various wildlife, including koalas and birds. The wood of the Mountain Ash is valued for its strength and is used in construction and furniture making.